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Equity - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Feb. 28, 2016 | Sep. 30, 2015 | Nov. 30, 2014 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2014
Disclosure of equity [line items] |  |  |  |  |  |  |  |  |  |  |
Dividend payable annual percentage |  | 40.00% |  |  |  |  |  |  |  |  |
Dividends payable per share |  |  |  |  | $ 0.75 | $ 0.75 | $ 0.51 | $ 0.51 |  | $ 0.51 |
Treasury stock [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of equity [line items] |  |  |  |  |  |  |  |  |  |  |
Share repurchase program authorized amount |  |  |  | $ 250,000,000 |  |  |  |  |  |  |
Number of shares repurchase program |  |  |  |  |  |  |  |  | 167,650 |  |
Share repurchase program period value |  |  |  |  |  |  |  |  | $ 17,900,000 |  |
Accelerated share repurchase [member] | Citibank one [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of equity [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares repurchase program | 1,960,250 |  |  |  |  |  |  |  |  |  |
Share repurchase program period value |  |  | $ 100,000,000 |  |  |  |  |  |  |  |
Stock repurchase program maturity period |  |  | 3 months |  |  |  |  |  |  |  |
Share repurchase program settlement amount per share | $ 51.01 |  |  |  |  |  |  |  |  |  |
Class A common stock [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of equity [line items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorised |  |  |  |  | 80,000,000 |  |  |  |  |  |
Common stock, shares issued |  |  |  |  | 33,776,480 |  |  |  |  | 33,743,286 |
Common stock, shares outstanding | 31,017,102 |  |  |  | 31,185,641 |  |  |  |  | 31,112,356 | 33,050,298
Class B common stock [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of equity [line items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorised |  |  |  |  | 80,000,000 |  |  |  |  |  |
Common stock, shares issued |  |  |  |  | 10,938,125 |  |  |  |  | 10,938,125 |
Common stock, shares outstanding | 10,938,125 |  |  |  | 10,938,125 |  |  |  |  | 10,938,125 | 10,938,125
Class C common stock [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of equity [line items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorised |  |  |  |  | 80,000,000 |  |  |  |  |  |
Common stock, shares outstanding |  |  |  |  | 0 |  |  |  |  | 0 |

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